blog-API-Gateway-Routing

code.md

(defn get-proxy-uri
  "Parse the proxied uri forwarded by the ions api-gateway data"
  [req]
  (try
    (let [path (-> req :datomic.ion.edn.api-gateway/json (json/read-str :key-fn keyword) :pathParameters :proxy)]
      (str "/" path))
    (catch Exception e nil)))

(defn wrap-proxy-uri
  "Look in the proxied api-gateway data and re-assign the URI for routing purposes.
   The API is likely configured with some resources and custom url. This middleware changes something like this
      :uri stage-route/proxy-resource/one/two/three
   to
      :uri /one/two/three"
  [handler]
  (fn [request]
    (if-let [proxy-uri (get-proxy-uri request)]
      (handler (assoc request :uri proxy-uri))
      (handler request))))

(defn wrap-middleware
  [handler & [formats]]
  (-> handler
      ; rejig the proxied uri
      wrap-proxy-uri
      ))

(def web-handler (wrap-middleware (bidi.routes/make-handler routes)))

(def web-router (apigw/ionize web-handler))